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Gets the collection of column chart groups on a 2-D chart.
Use this property to access the IChartGroups collection for a column chart and then retrieve individual IChartGroup objects from that collection.
IChartGroups ColumnGroups { get; }
ReadOnly Property ColumnGroups As IChartGroups
IChart chart = worksheet.Shapes.AddChart(ChartType.ColumnClustered, 20, 20, 300, 200).Chart;
IChartGroups columnGroups = chart.ColumnGroups;
IChartGroup columnGroup = columnGroups[0];